What will be the percentage error in measuring \( \mathrm{P} \) hydrogen ion concentration in a ...

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What will be the percentage error in measuring
\( \mathrm{P} \)
hydrogen ion concentration in a \( 10^{-6} \mathrm{M}-\mathrm{HCl} \) solution
W
on neglecting the contribution of water at \( 25^{\circ} \mathrm{C} \) ?
(1) \( 5 \% \)
(2) \( 9.8 \% \)
(3) \( 1.98 \% \)
(4) \( 0.98 \% \)
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